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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1568771cdc4da38cac486cecede0bf6e0a1fcb1b0cdba63be8a03bfde16ba2' 
  AND token = 'n4Oh0vXTVCfmfr2ej1IsXPeHUb9Kj4O8t6X8BCJPDV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}